| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0HK | 153 | 38.64 % | | 153 | 37.68 % | | 2 | C D C C C | K0AJW | 102 | 25.76 % | | 102 | 25.12 % | | 3 | C C D C | AA3B | 55 | 13.89 % | | 55 | 13.55 % | | 4 | C C D C C | AA4RV | 42 | 10.61 % | | 42 | 10.34 % | | 5 | C C D C C C | KA2FIR | 32 | 8.08 % | | 32 | 7.88 % | | 6 | C D C | K1B | 12 | 3.03 % | | 13 | 3.20 % | |
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